Well I hadn't recovered it.After 2 calls to Apple support either side of a pointless response from Bkool I may have recovered my MacBook after it was assaulted by the Bkool Sim beta.
I uninstalled the Beta and the install helper after my MacBook went into a series of crashes and restarts. I sent as much detail as I could to Bkool and told them that I'd uninstalled the Beta. They asked me to click on settings and send some additional information to them!! Idiots!!!!
2nd call to Apple support this morning resulted in deleting a number of files in cache and other folders. It may have worked this time, but I'm booked in for an Apple store appointment in Brighton on Thursday just to check out that everything is running ok.
Needless to say, any software containing the words Bkool and Beta will be going nowhere near my MacBook from here on.